Usually these were more lift bars and as such had no upper bar/lower bar adjustment, only a rod end at the front to true them up to the chassis. The purpose of these was two fold: Keep the rear from winding up on the springs, and to transfer lift to the chassis to get the front end up under accelleration. They weren't as effective as later developments, but they sure look cool hanging down under there.

Don

(any progress yet, Dave? We're waiting............... )